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Sierra Ladrones, New Mexico, USA

Formation	Sierra Ladrones
Member(s)	Unit 1
Age:	1.80 - 0.30 Ma Pleistocene
Interval	Blancan
Number of Collections	9
Number of Occurrences	12

Recorded Sample Locations

Location	Region	Stratigraphic Name
Gabaldon Badlands Level A	Valencia County, New Mexico, USA	Sierra Ladrones - Unit 1
Carthage	Socorro County, New Mexico, USA	Sierra Ladrones
Tijeras	Bernalillo County, New Mexico, USA	Sierra Ladrones
Mesa Portales	Sandoval County, New Mexico, USA	Sierra Ladrones

Associated Units

Stratigraphic Name	Age	Lithology	Occurrence Records
Baca	40.4 - 37.2 Ma Eocene		12
Diamond Trail - middle	55.8 - 50.3 Ma Eocene		1
Hart Mine	50.3 - 46.2 Ma Eocene		2
Nacimiento	63.3 - 56.0 Ma Paleocene	siltstone, mudstone, claystone/sandstone, "siliciclastic", sandstone, claystone	511
Nacimiento - Pantolambda Zone	63.3 - 61.7 Ma Paleocene		15
Palomas	4.90 - 1.80 Ma Cenozoic	sandstone/conglomerate	18
Pictured Cliffs Sandstone	83.5 - 70.6 Ma Late/Upper Cretaceous		24
Popotosa - Unit 1	13.6 - 4.90 Ma Neogene		1
Popotosa - Unit 2	10.3 - 4.90 Ma Neogene		2
Popotosa - Unit 3	10.3 - 4.90 Ma Neogene		19
San Jose	3.00 - 0.78 Ma Cenozoic	sandstone, siltstone/claystone, marl	140
San Jose - Regina	55.8 - 50.3 Ma Eocene		129
Santa Fe	23.0 - 5.33 Ma Miocene		2
Sierra Ladrones - Unit 1	23.0 - 5.33 Ma Miocene		1
Zia	23.0 - 5.33 Ma Miocene		5
Zia - Cerro Conejo	16.0 - 10.3 Ma Miocene		13
Zia Sand	23.0 - 5.33 Ma Miocene		4
Zia Sand - basal Piedra Parada	24.8 - 20.4 Ma Cenozoic		9
Zia Sand - Chamisa Mesa	20.4 - 5.33 Ma Miocene		26
Zia Sand - lower Chamisa Mesa	20.4 - 5.33 Ma Miocene		15
Zia Sand - middle Chamisa Mesa	23.0 - 5.33 Ma Miocene		1
Zia Sand - top of the Pilares	23.0 - 5.33 Ma Miocene		1

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Camelops sp. genus	6	Animalia : Chordata : Mammalia : Artiodactyla : Camelidae : *Camelops*	1.8 - 0.3 Ma Pleistocene
Hemiauchenia sp. genus	6	Animalia : Chordata : Mammalia : Artiodactyla : Camelidae : *Hemiauchenia*	23.03 - 5.333 Ma Miocene
Hypolagus gidleyi species	7	Animalia : Chordata : Mammalia : Lagomorpha : Leporidae : Hypolagus : *Hypolagus gidleyi*	4.9 - 1.8 Ma Cenozoic
Equus sp. genus	6	Animalia : Chordata : Mammalia : Perissodactyla : Equidae : *Equus*	4.9 - 1.8 Ma Cenozoic
Equus (Dolichohippus) simplicidens species	7	Animalia : Chordata : Mammalia : Perissodactyla : Equidae : Equus : *Equus (Dolichohippus) simplicidens*	4.9 - 1.8 Ma Cenozoic
Equus scotti species	7	Animalia : Chordata : Mammalia : Perissodactyla : Equidae : Equus : *Equus scotti*	4.9 - 1.8 Ma Cenozoic
Mammuthus sp. genus	6	Animalia : Chordata : Mammalia : Proboscidea : Elephantidae : *Mammuthus*	1.8 - 0.3 Ma Pleistocene
Mammuthus columbi species	7	Animalia : Chordata : Mammalia : Proboscidea : Elephantidae : Mammuthus : *Mammuthus columbi*	1.8 - 0.3 Ma Pleistocene
Archidiskodon hayi species	7	Animalia : Chordata : Mammalia : Proboscidea : Elephantidae : Mammuthus : *Archidiskodon hayi*	1.8 - 0.3 Ma Pleistocene
Mastodon mirificus species	7	Animalia : Chordata : Mammalia : Proboscidea : Gomphotheriidae : Stegomastodon : *Mastodon mirificus*	4.9 - 1.8 Ma Cenozoic
Glyptotherium sp. genus	6	Animalia : Chordata : Mammalia : Cingulata : Glyptodontidae : *Glyptotherium*	1.8 - 0.3 Ma Pleistocene
Glyptotherium texanum species	7	Animalia : Chordata : Mammalia : Xenarthra : Glyptodontidae : Glyptotherium : *Glyptotherium texanum*	1.8 - 0.3 Ma Pleistocene

References

Denny C. S. (1940) Tertiary Geology of the San Acacia Area New Mexico, Journal of Geology 48 1

Lozinsky R. P., Tedford R. H. (1991) Geology and Paleontology of the Santa Fe Group, Southwestern Albuquerque Basin, Valencia County, New Mexico, Bulletin of the New Mexico Bureau of Mines and Mineral Research 132, 1-35

Lucas S. G., Williamson T. E., et al (1993) Plio-Pleistocene stratigraphy, paleoecology, and mammalian biochronology, Tijeras Arroyo, Albuquerque area, New Mexico, New Mexico Geology 15 1, 1-8

Alroy J. (2002) Synonymies and reidentifications of North American fossil mammals

Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!

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